SERVICE PROCEDURE MAINTENANCE
4-42
PROCEDURE FOR BLEEDING AIR IN HYDRAULIC SYSTEM 4
See “STARTING ENGINE (3-89)“.
Since the engine must be started and the blade must be operated, see OPERATION.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.
1. Bleeding air from cylinders
2. Run the engine at low idling, and extend and retract each
cylinder 4 to 5 times, taking care so that a cylinder may not
be brought up to its stroke end. (Stop the cylinder approx.
100 mm (3.9 in) short of its stroke end)
3. Next, operate each cylinder 3 to 4 times to the end of its
stroke.
4. Finally, operate each cylinder 4 to 5 times to the end of its
stroke to completely remove the air.
PROCEDURE FOR RELEASING INTERNAL PRESSURE OF HYDRAULIC SYSTEM 4
WARNING
q The hydraulic system is always under internal pressure, so when inspecting or replacing the piping or
hoses, always release the pressure in the circuit before starting. If the pressure is not released, high
pressure oil may spurt out and cause serious personal injury.
q The parts and oil are at high temperature after the engine is stopped, and may cause serious burns.
Wait for the temperature to go down before starting the operation.
q When the oil filler cap is removed, oil may spurt out, so turn the cap slowly to release the pressure
before removing the cap.
1. Stop the machine on firm level ground.
2. Lower the blade to the ground, then stop the engine.
3. After stopping the engine, operate the blade control lever
fully in all directions to release the internal pressure.
4. Loosen oil filler cap (F) at the top of the hydraulic tank
slowly to release the internal pressure.
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